Skin brush



FIG. 1 is a top left rear perspective view of a skin brush;

FIG. 2 is a bottom right front perspective view of a skin brush;

FIG. 3 is a left side elevational view of a skin brush design;

FIG. 4 is a rear elevational view of a skin brush;

FIG. 5 is a right side elevational view of a skin brush;

FIG. 6 is a front elevational view of a skin brush;

FIG. 7 is a top plan view of a skin brush; and,

FIG. 8 is a bottom plan view of a skin brush.

Dashed lines represent unclaimed environment and form no part of the claimed design. 

CLAIM The ornamental design for a skin brush, as shown and described. 